Pressure-indicator.



L. H. COKE PRESSURE INDICATOR.

APPLICATION FILED JULY 28. 19M.

Patented July 27, 1915.

LOUIS I-I. COKE, OJF'S AN DIEGO, CALIFORNIA. i

PRESSURE-INDICATOR.

To all whom it may concern.

Be it known that 1, Louis H. Come, a citizen of the United States, residing at San Diego, in the county of San Diego and State of California, have invented new and useful Improvements in Pressure-Indicators, of which the following is a specification.

This invention relates to pressure i-ndicators for use in determining the working pressure within a cylinder of an engine, such as lnternal combustion engines, when such pressure is desired to be known.

The primary object of'the invention is to provide an indicator which may be applied to thespark plug opening of an engine cylinder, and whereby, upon the operation of the engine, a sight indication of the working pressure within the cylinder may be obtained.

A further object of the invention is to provideggaa indicator which may be employed-for determining the working pressure within a cylinder of any type of internal combustion engine, and which operates by gradual storage of pressure within the indicator until the pressure within the indicator equalizes that within the engine cylinder, whereby an accurate indicaton of the working pressure within the cylinder may be obtained. i

The- 'nvention consists of the features of construction, combination and arrangement of parts herein fully described and claimed, reference being had to the accompanying drawing in which Figure 1 1s an elevational view of the device as applied for use, showing the relief valve in closed position. Fig. 2 is a vertical section through the device, showing the relief valve in open or relief position.

The device comprises a pressure chamber 1, with the upper portion of which communicates a pressure gage 2 or other suitable sight-reading pressure indicating device. The base of the pressure chamber 1 is integral with or suitably connected to a bracket or head 3 provided with a suitable attaching fitting, such as a tubular screw stem 4 provided with an angular collar or head 5 threaded or swiveled to said bracket. The tubular stem 4 is adapted to fit within the spark plug opening of an engine cylinder, and the collar or head 5 is of a form to receive a wrench whereby the stem may be screwed in or out. The fitting may be detached from the bracket, so that fittings to cater.-

. The bracket upper end with the cylinder 1 and at its lower end with the stem .4, which duct or passage is controlled by an upwardly opening check valve 7. The bracket, is also proyided with. a relief passage 8 communicatmg at. its upperfend with the cylinder and v I 3 is provided witha pressureflow ductor passage 6 communicating at its Specification of Letters Patents p m mfl ,1] y g y 1gp 5 flpplication filed Ju1y28, 1914.. 1 serial Ito, 8533 h I suit different'siae spark plug openings may 7 be employed-upon oneand the: same indi-f f l at its lower end with the stem' l. This passage 8 is controlled by a rotary plug 9 having anfoperating handle 10 and an indicatlng hand .or pointer 1'1, the latter being adapted to cooperate'with suitable indicav tions, such as"0fi' and on on the exterior of the bracket, to indicate when the valve is in open and closed positions. 7

In practice, the'device is applied to the engine cylinder whose working pressure is to be determined by removing the s ark plug therefrom and fitting the stem 4 withihjllf the spark plug opening, after which the valve 9, if open, is moved to closed position and the engine operated onv the-remaining cylinders or by hand. The pressure from the cyllnder will pass upward through the duct 6 and raise the valve 7 and will be stored in the chamber 1, beingheld in said is ascertained, the relief valve 9 is opened to allowthe pressure to vent from the chamber 1, after which the device may be removed and the spark plug of the engine cylinder reinserted.

Thedevice will be found of value whenever it is desired to determine the working action of the cylinders of any type of internal combustion engine, and by the use of proper fittings the device may be applied to any cylinder for the designed purpose.

I claim A device for determining the working pressure within an engine cylinder, comprising a cylinder formm the side wall of a pressure chamber, a bee detachably clot,

to I

ing the top of said pressure chamber and provided with a pressure gage communicating therewith, a head detachably closing the bottom of the pressure chamber and having a bracket formed integral therewith, said bracket being provided with a reduced .ex--

ternally threaded lower end, and having a pair of continuous, parallel longitudinal passages extending through said head and bracket and communicating at their upper ends with the pressure chamber, one of said passages being provided with a circular en largement and the other of said passages being diametrically enlarged at its upper end and provided with a valve seat, a ro- 15 tary'valve fitted in the enlargement of the first-named passage and adjustable to control the latter, and a gravity movable check valve arranged in the enlarged portion of the other passage and adapted to engage 20 said valve seat to control said passage.

In testimony whereof I afiix my signature in presence of two witnesses.

LOUIS H. COXE.

Witnesses:

W. L. FLAGG, H. D. W. FLAGG. 

